• World Neurosurg · Jan 2021

    Case Reports

    Orthostatic Enlargement of a Supracerebellar Arachnoid Cyst With Cerebellar Descent Visualized by Upright Computed Tomography.

    • Keisuke Yoshida, Masahiro Toda, Yoshitake Yamada, Minoru Yamada, Yoichi Yokoyama, Hirokazu Fujiwara, Kenzo Kosugi, Hikaru Sasaki, and Masahiro Jinzaki.
    • Department of Neurosurgery, Keio University School of Medicine, Tokyo, Japan. Electronic address: yoshikei47@gmail.com.
    • World Neurosurg. 2021 Jan 1; 145: 256-259.

    BackgroundPosterior fossa arachnoid cysts are often asymptomatic, but can rarely cause postural headache, the mechanism of which remains unknown.Case DescriptionWe present a 40-year-old woman with an asymptomatic supracerebellar arachnoid cyst. Upright computed tomography (CT) showed enlargement of the arachnoid cyst and caudal descent of the cerebellum compared with supine CT with narrowing of the craniocervical junction cerebrospinal fluid space.ConclusionsThis finding aids in understanding the association of posterior fossa arachnoid cysts with orthostatic headache. Clinicians should be aware of possible posture-related changes in intracranial structures.Copyright © 2020 Elsevier Inc. All rights reserved.

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